三次致孔法制备类沸石分子筛的研究

Synthesis of Highly Selective Zeolite Topology Molecular Sieve Using Third Foaming Method

本研究以山东粉煤灰(FA_1)、房山粉煤灰(FA_2)及黑龙江粉煤灰(FA_3)为原料,采用三次致孔法水热晶化合成类沸石分子筛,并研究了三次致孔法处理粉煤灰的晶型转化和颗粒团聚变化。并采用X射线衍射(XRD)、扫描电子显微镜(SEM)和X荧光法(XRF)进行检测。结果表明,以20%HCl、液固比(L/S)为10的活化条件处理FA_1,得到物相单一且表面结构稳定的晶体;10 mol/L NaOH的改性条件下,进一步得到结晶良好的团聚体;晶化条件:硅铝物质的量比(Si/Al)为7.9,晶化温度为140℃,晶化时间为8 h,制备出对苯蒸气吸附率为63.72%的类沸石分子筛。

Shangdong fly ash（FA_1）,Fangshan fly ash（FA_2） and Heilongjiang fly ash（FA_3） were selected as the raw materials to be used for synthesis of highly selective zeolite topology molecular sieve.The crystal transformation and particles reunion were studied in terms of synthetic zeolite by third foaming method.The experimental products were characterized by means of X-ray fluorescence（XRF）,scanning electron microscope（SEM）,and X-ray diffraction（XRD）.The result indicated that the condition of modification experiment is FA_1 processed by 10 mol/L NaOH,crystallization temperature and time are 140 °C and 8 h,respectively.With Si/Al of 7.9,zeolite topology molecular sieve is prepared,and the adsorption ratio is 63.72% for benzene gas.